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Colour

#1F4171

  • #1F4171
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1F4171 is a blue with RGB values 31, 65, 113 and HSL 215°, 57%, 28%. It is a dark colour, so white text on it reaches 10.2:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1F4171#1F4171
HEX#1F4171
RGBrgb(31, 65, 113)
RGB (0–1)0.1216, 0.2549, 0.4431
RGB percentages12.2%, 25.5%, 44.3%
HSLhsl(215.1, 56.9%, 28.2%)
HSV / HSBhsv(215.1, 72.6%, 44.3%)
CMYK72.6%, 42.5%, 0%, 55.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,048,369
CSS custom property--colour: #1F4171;

Brightness & contrast

Relative luminance0.05264WCAG 2.x, 0 is black and 1 is white
Perceived brightness65 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.23:1
Contrast with white10.23:1WCAG normal text: AAA
Contrast with black2.05:1WCAG normal text: Fail
Greyscale equivalent#3D3D3D
Inverted#E0BE8E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2B4573no red cones; affects about 1% of men; ΔE 2.7 from the original
Deuteranopia#1E3D70no green cones; the most common form, about 1% of men; ΔE 3 from the original
Tritanopia#004C53no blue cones; rare, and affects men and women equally; ΔE 31.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.23:1WCAG large text: AAA
Contrast with black, large text2.05:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 23.7Steel blue · ΔE 26.7Dark slate grey · ΔE 32.6Slate grey · ΔE 33.6Midnight blue · ΔE 34.2Light slate grey · ΔE 35.7
Nearest named CSS colourDark slateblue (#483D8B)ΔE 23.65, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#714F1F
Analogous#1F6A71, #261F71
Triadic#711F41, #41711F
Split complementary#71261F, #6A711F
Tetradic#711F6A, #714F1F, #1F7126

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#80A6DC
Lighter +30%#588AD1
Lighter +20%#356FC1
Lighter +10%#2A5899
Darker −10%#142A49
Darker −20%#091321
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0D3E83
Less saturated −25%#31445F

Channel breakdown

R31
G65
B113
Red31 (12.2%)
Green65 (25.5%)
Blue113 (44.3%)
Hue215.12°
Saturation (HSL)56.94%
Lightness28.24%
Dominant channelBlue
Hex per channelR 1F · G 41 · B 71

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Every value on this page was computed from “1f4171” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.